Electron-hole superconductivity (Review Article)

This review is devoted to the theory of electron-hole super-fluidity in double-layer systems. The question is about the state in that electrons and holes from adjacent layers form bound pairs and nondissipative transfer of charge is provided by motion of pairs as wholes. The occurrence of flow of bound pairs is equivalent to the flowing equal in module and the oppositely directed electric currents in conducting layers. Therefore such super-fluidity can be considered as a special type of superconductivity that is often called counterflow superconductivity. This phenomenon was predicted about 40 years ago, but the study of the problem of electron-hole superconductivity in the double-layer systems is in progress until now. In the review the extensive description of theoretical grounds and approaches to the problem of electron-hole superconductivity is presented.

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